/* ============================================================
   智能科技 · 企业官网首页样式
   风格：科技型企业风（深蓝 Hero + 浅色正文）
   ============================================================ */

:root {
  --navy-900: #071426;
  --navy-800: #0b1f3a;
  --navy-700: #10305c;
  --blue-600: #1667d9;
  --blue-500: #2483f2;
  --cyan-400: #38c6f4;
  --ink-900: #10203a;
  --ink-600: #4a5b74;
  --line: #e3eaf4;
  --bg: #f5f8fc;
  --white: #ffffff;
  --header-h: 72px;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 48, 92, 0.08);
  --shadow-lg: 0 18px 50px rgba(16, 48, 92, 0.14);
  --grad: linear-gradient(120deg, var(--blue-600), var(--cyan-400));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink-900);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--blue-500); outline-offset: 3px; border-radius: 4px; }
.container { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(7, 20, 38, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(140, 190, 255, 0.14);
}
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; font-size: 20px; letter-spacing: 0.1em; font-weight: 600; }
.logo-plate {
  width: 46px; height: 46px; flex: none;
  background: #fff; border-radius: 10px;
  display: grid; place-items: center;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18);
}
.logo-plate img { width: 38px; height: 38px; object-fit: contain; }
.main-nav { display: flex; align-items: center; gap: 26px; font-size: 15px; color: #b9cbe4; }
.main-nav a { position: relative; padding: 6px 0; transition: color 0.2s; }
.main-nav a:hover { color: #fff; }
.main-nav a.active { color: #fff; }
.main-nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; border-radius: 2px; background: var(--grad);
}
.main-nav a.nav-cta {
  padding: 10px 26px; border-radius: 999px;
  background: var(--grad); color: #fff; font-weight: 500;
  box-shadow: 0 4px 14px rgba(36, 131, 242, 0.4);
  transition: 0.2s; white-space: nowrap;
}
.main-nav a.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(36, 131, 242, 0.55); }
.main-nav a.nav-cta.active::after { display: none; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; transition: 0.25s; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative; overflow: hidden;
  background: radial-gradient(120% 100% at 20% 0%, var(--navy-700) 0%, var(--navy-900) 55%);
  color: #eaf3ff;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.55; }
.orb-a { width: 480px; height: 480px; right: -120px; top: -140px; background: rgba(36, 131, 242, 0.5); animation: drift 14s ease-in-out infinite alternate; }
.orb-b { width: 380px; height: 380px; left: -100px; bottom: -160px; background: rgba(56, 198, 244, 0.32); animation: drift 18s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { transform: translate(40px, 30px) scale(1.08); } }
.net-layer { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }

.hero-inner { position: relative; padding: 110px 0 90px; max-width: 820px; }
.hero-eyebrow {
  display: inline-block; margin: 0 0 18px;
  padding: 6px 16px; border-radius: 999px;
  border: 1px solid rgba(140, 200, 255, 0.35);
  color: #9fd0ff; font-size: 14px; letter-spacing: 0.12em;
}
.hero h1 { margin: 0 0 20px; font-size: clamp(38px, 6vw, 64px); line-height: 1.2; font-weight: 700; letter-spacing: 0.02em; }
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #6cc2ff, #38e0f4);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lede { margin: 0 0 34px; max-width: 40em; color: #b9cbe4; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 56px; }

.btn {
  display: inline-block; padding: 12px 30px; border-radius: 999px;
  font-size: 15px; font-weight: 500; transition: 0.2s; border: 0; cursor: pointer;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px rgba(36, 131, 242, 0.45); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(36, 131, 242, 0.55); }
.btn-ghost { border: 1px solid rgba(160, 205, 255, 0.5); color: #dcebff; }
.btn-ghost:hover { background: rgba(140, 200, 255, 0.12); }
.btn-light { background: #fff; color: var(--blue-600); font-weight: 600; }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0, 0, 0, 0.25); }
.btn-outline-light { border: 1px solid rgba(255, 255, 255, 0.7); color: #fff; }
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.12); }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin: 0; padding: 26px 0 0;
  border-top: 1px solid rgba(140, 190, 255, 0.18);
}
.hero-stats dt { font-size: 34px; font-weight: 700; color: #6cc2ff; line-height: 1.2; }
.hero-stats dd { margin: 0; font-size: 13px; color: #9db4d4; }

/* ---------- 通用板块 ---------- */
.section { padding: 90px 0; }
.section-alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-dark { background: var(--navy-900); color: #e8f1fb; }
.section-head { text-align: center; margin-bottom: 52px; }
.section-eyebrow { margin: 0 0 10px; font-size: 13px; letter-spacing: 0.3em; color: var(--blue-500); font-weight: 600; }
.section-dark .section-eyebrow { color: var(--cyan-400); }
.section-head h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 38px); font-weight: 700; }
.section-sub { margin: 0; color: var(--ink-600); }
.section-dark .section-sub { color: #9db4d4; }

/* ---------- 公司介绍 ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: start; }
.about-text p { margin: 0 0 18px; color: var(--ink-600); }
.about-text strong { color: var(--blue-600); }
.value-cards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.value-cards li {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; box-shadow: var(--shadow); transition: 0.25s;
}
.value-cards li:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: rgba(36, 131, 242, 0.35); }
.value-cards svg { width: 34px; height: 34px; stroke: var(--blue-500); fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 12px; }
.value-cards h3 { margin: 0 0 6px; font-size: 17px; }
.value-cards p { margin: 0; font-size: 14px; color: var(--ink-600); }

/* ---------- 业务布局 ---------- */
.biz-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.biz-card {
  position: relative; overflow: hidden; display: block;
  padding: 36px 32px; border-radius: 18px; color: #fff;
  transition: 0.3s; box-shadow: var(--shadow-lg);
}
.biz-card::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: 40px 40px; pointer-events: none;
}
.biz-card:hover { transform: translateY(-6px); }
.biz-health { background: linear-gradient(135deg, #0e7d6f, #16a894); }
.biz-ai { background: linear-gradient(135deg, var(--blue-600), var(--navy-700)); }
.biz-icon {
  width: 60px; height: 60px; border-radius: 16px; margin-bottom: 20px;
  background: rgba(255, 255, 255, 0.16); display: grid; place-items: center;
}
.biz-icon svg { width: 32px; height: 32px; stroke: #fff; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.biz-card h3 { margin: 0 0 12px; font-size: 24px; }
.biz-card p { margin: 0 0 20px; color: rgba(255, 255, 255, 0.88); font-size: 15px; }
.biz-more { font-size: 14px; color: #fff; font-weight: 500; }

.synergy { display: flex; align-items: center; justify-content: center; gap: 22px; margin-top: 44px; flex-wrap: wrap; }
.syn-node {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 24px; text-align: center; font-weight: 600; box-shadow: var(--shadow);
}
.syn-node span { display: block; font-size: 13px; font-weight: 400; color: var(--ink-600); }
.syn-link svg { width: 110px; stroke: var(--blue-500); stroke-width: 2; fill: none; }

/* ---------- 健康产业 ---------- */
.health-lead { max-width: 46em; margin: 0 auto 44px; text-align: center; color: var(--ink-600); }
.health-lead strong { color: var(--blue-600); }
.chain {
  list-style: none; margin: 0 0 40px; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  counter-reset: step;
}
.chain li {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 20px; position: relative; box-shadow: var(--shadow); transition: 0.25s;
}
.chain li:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.chain-step {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 10px; margin-bottom: 14px;
  background: var(--grad); color: #fff; font-weight: 700; font-size: 14px;
}
.chain h3 { margin: 0 0 6px; font-size: 18px; }
.chain p { margin: 0; font-size: 14px; color: var(--ink-600); }
.mini-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mini-card {
  padding: 20px 22px; border-left: 3px solid var(--blue-500); border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--white); box-shadow: var(--shadow);
}
.mini-card h4 { margin: 0 0 6px; font-size: 16px; }
.mini-card p { margin: 0; font-size: 14px; color: var(--ink-600); }

/* ---------- 人工智能 ---------- */
.ai-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.ai-text p { color: #b9cbe4; }
.ai-text strong { color: #6cc2ff; }
.ai-counter {
  display: flex; align-items: center; gap: 18px;
  margin-top: 26px; padding: 22px 24px;
  background: rgba(36, 131, 242, 0.12); border: 1px solid rgba(108, 194, 255, 0.3);
  border-radius: var(--radius);
}
.ai-counter strong { font-size: 46px; font-weight: 700; color: #6cc2ff; line-height: 1; flex: none; }
.ai-counter span { font-size: 14px; color: #9db4d4; }
.ai-cards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.ai-cards li {
  padding: 24px 22px; border-radius: var(--radius);
  background: rgba(16, 48, 92, 0.55); border: 1px solid rgba(140, 190, 255, 0.18);
  transition: 0.25s;
}
.ai-cards li:hover { background: rgba(36, 131, 242, 0.2); border-color: rgba(108, 194, 255, 0.45); transform: translateY(-4px); }
.ai-cards h3 {
  margin: 0 0 8px; font-size: 20px;
  background: linear-gradient(100deg, #6cc2ff, #38e0f4);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.ai-cards p { margin: 0; font-size: 14px; color: #9db4d4; }

/* ---------- 核心优势 ---------- */
.strength-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.strength-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; box-shadow: var(--shadow); transition: 0.25s; text-align: center;
}
.strength-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.strength-card b { display: block; font-size: 18px; margin-bottom: 10px; color: var(--blue-600); }
.strength-card p { margin: 0; font-size: 14px; color: var(--ink-600); }

/* ---------- 基地布局 ---------- */
.bases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.base-group {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.base-group h3 {
  margin: 0 0 14px; font-size: 16px; padding-bottom: 10px;
  border-bottom: 2px solid var(--grad); display: inline-block;
}
.base-group ul { list-style: none; margin: 0; padding: 0; }
.base-group li { padding: 7px 0; font-size: 14px; color: var(--ink-600); position: relative; padding-left: 16px; }
.base-group li::before { content: ""; position: absolute; left: 0; top: 15px; width: 7px; height: 7px; border-radius: 50%; background: var(--blue-500); }

/* ---------- CTA ---------- */
.cta {
  background:
    radial-gradient(80% 120% at 80% 0%, rgba(56, 198, 244, 0.25), transparent 60%),
    linear-gradient(120deg, var(--navy-800), var(--navy-900));
  color: #fff; padding: 80px 0; text-align: center;
}
.cta h2 { margin: 0 0 12px; font-size: clamp(26px, 4vw, 36px); }
.cta p { margin: 0 0 30px; color: #b9cbe4; }
.cta-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy-900); color: #9db4d4; border-top: 1px solid rgba(140, 190, 255, 0.12); }
.footer-grid {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 40px; flex-wrap: wrap; padding: 44px 0 30px;
}
.footer-brand { display: flex; gap: 14px; align-items: center; }
.footer-brand b { display: block; color: #fff; font-size: 18px; letter-spacing: 0.1em; }
.footer-brand p { margin: 4px 0 0; font-size: 13px; }
.footer-info { list-style: none; margin: 0; padding: 0; font-size: 14px; display: grid; gap: 8px; }
.footer-info a { color: #6cc2ff; }
.footer-info a:hover { text-decoration: underline; }
.footer-copy { border-top: 1px solid rgba(140, 190, 255, 0.1); padding: 18px 0 24px; }
.footer-copy p { margin: 0; font-size: 13px; text-align: center; color: #6f87a8; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--grad); color: #fff; font-size: 18px;
  box-shadow: 0 8px 20px rgba(36, 131, 242, 0.45);
  opacity: 0; visibility: hidden; transform: translateY(10px); transition: 0.25s;
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { transform: translateY(-3px); }

/* ---------- 滚动进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .about-grid, .ai-grid, .biz-grid { grid-template-columns: 1fr; }
  .chain { grid-template-columns: repeat(2, 1fr); }
  .strength-grid, .bases-grid { grid-template-columns: repeat(2, 1fr); }
  .mini-cards { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .main-nav {
    position: fixed; inset: var(--header-h) 0 auto 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(7, 20, 38, 0.98); backdrop-filter: blur(14px);
    padding: 12px 24px 20px; display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 13px 4px; border-bottom: 1px solid rgba(140, 190, 255, 0.12); }
  .nav-cta { margin-top: 14px; text-align: center; border-bottom: 0 !important; }
  .nav-toggle { display: block; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero-inner { padding: 72px 0 64px; }
  .section { padding: 64px 0; }
  .chain, .strength-grid, .bases-grid, .value-cards { grid-template-columns: 1fr; }
  .ai-cards { grid-template-columns: 1fr; }
  .ai-counter { flex-direction: column; text-align: center; }
  .footer-grid { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orb { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}